Commit | Line | Data |
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b3b94faa DT |
1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
da6dd40d | 3 | * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved. |
b3b94faa DT |
4 | * |
5 | * This copyrighted material is made available to anyone wishing to use, | |
6 | * modify, copy, or redistribute it subject to the terms and conditions | |
e9fc2aa0 | 7 | * of the GNU General Public License version 2. |
b3b94faa DT |
8 | */ |
9 | ||
10 | #include <linux/sched.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/spinlock.h> | |
13 | #include <linux/completion.h> | |
14 | #include <linux/buffer_head.h> | |
71b86f56 | 15 | #include <linux/crc32.h> |
5c676f6d | 16 | #include <linux/gfs2_ondisk.h> |
f45b7ddd | 17 | #include <linux/bio.h> |
b3b94faa DT |
18 | |
19 | #include "gfs2.h" | |
5c676f6d | 20 | #include "incore.h" |
b3b94faa DT |
21 | #include "bmap.h" |
22 | #include "dir.h" | |
b3b94faa DT |
23 | #include "glock.h" |
24 | #include "glops.h" | |
25 | #include "inode.h" | |
26 | #include "log.h" | |
27 | #include "meta_io.h" | |
28 | #include "quota.h" | |
29 | #include "recovery.h" | |
30 | #include "rgrp.h" | |
31 | #include "super.h" | |
32 | #include "trans.h" | |
5c676f6d | 33 | #include "util.h" |
b3b94faa | 34 | |
fefc03bf SW |
35 | /** |
36 | * gfs2_jindex_free - Clear all the journal index information | |
37 | * @sdp: The GFS2 superblock | |
38 | * | |
39 | */ | |
40 | ||
41 | void gfs2_jindex_free(struct gfs2_sbd *sdp) | |
42 | { | |
43 | struct list_head list, *head; | |
44 | struct gfs2_jdesc *jd; | |
45 | struct gfs2_journal_extent *jext; | |
46 | ||
47 | spin_lock(&sdp->sd_jindex_spin); | |
48 | list_add(&list, &sdp->sd_jindex_list); | |
49 | list_del_init(&sdp->sd_jindex_list); | |
50 | sdp->sd_journals = 0; | |
51 | spin_unlock(&sdp->sd_jindex_spin); | |
52 | ||
53 | while (!list_empty(&list)) { | |
54 | jd = list_entry(list.next, struct gfs2_jdesc, jd_list); | |
55 | head = &jd->extent_list; | |
56 | while (!list_empty(head)) { | |
57 | jext = list_entry(head->next, | |
58 | struct gfs2_journal_extent, | |
59 | extent_list); | |
60 | list_del(&jext->extent_list); | |
61 | kfree(jext); | |
62 | } | |
63 | list_del(&jd->jd_list); | |
64 | iput(jd->jd_inode); | |
65 | kfree(jd); | |
66 | } | |
67 | } | |
68 | ||
b3b94faa DT |
69 | static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid) |
70 | { | |
71 | struct gfs2_jdesc *jd; | |
72 | int found = 0; | |
73 | ||
74 | list_for_each_entry(jd, head, jd_list) { | |
75 | if (jd->jd_jid == jid) { | |
76 | found = 1; | |
77 | break; | |
78 | } | |
79 | } | |
80 | ||
81 | if (!found) | |
82 | jd = NULL; | |
83 | ||
84 | return jd; | |
85 | } | |
86 | ||
87 | struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid) | |
88 | { | |
89 | struct gfs2_jdesc *jd; | |
90 | ||
91 | spin_lock(&sdp->sd_jindex_spin); | |
92 | jd = jdesc_find_i(&sdp->sd_jindex_list, jid); | |
93 | spin_unlock(&sdp->sd_jindex_spin); | |
94 | ||
95 | return jd; | |
96 | } | |
97 | ||
b3b94faa DT |
98 | int gfs2_jdesc_check(struct gfs2_jdesc *jd) |
99 | { | |
feaa7bba SW |
100 | struct gfs2_inode *ip = GFS2_I(jd->jd_inode); |
101 | struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); | |
b3b94faa DT |
102 | int ar; |
103 | int error; | |
104 | ||
c9e98886 SW |
105 | if (ip->i_disksize < (8 << 20) || ip->i_disksize > (1 << 30) || |
106 | (ip->i_disksize & (sdp->sd_sb.sb_bsize - 1))) { | |
b3b94faa DT |
107 | gfs2_consist_inode(ip); |
108 | return -EIO; | |
109 | } | |
c9e98886 | 110 | jd->jd_blocks = ip->i_disksize >> sdp->sd_sb.sb_bsize_shift; |
b3b94faa | 111 | |
c9e98886 | 112 | error = gfs2_write_alloc_required(ip, 0, ip->i_disksize, &ar); |
b3b94faa DT |
113 | if (!error && ar) { |
114 | gfs2_consist_inode(ip); | |
115 | error = -EIO; | |
116 | } | |
117 | ||
118 | return error; | |
119 | } | |
120 | ||
b3b94faa DT |
121 | /** |
122 | * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one | |
123 | * @sdp: the filesystem | |
124 | * | |
125 | * Returns: errno | |
126 | */ | |
127 | ||
128 | int gfs2_make_fs_rw(struct gfs2_sbd *sdp) | |
129 | { | |
feaa7bba | 130 | struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode); |
5c676f6d | 131 | struct gfs2_glock *j_gl = ip->i_gl; |
b3b94faa | 132 | struct gfs2_holder t_gh; |
55167622 | 133 | struct gfs2_log_header_host head; |
b3b94faa DT |
134 | int error; |
135 | ||
1c0f4872 | 136 | error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &t_gh); |
b3b94faa DT |
137 | if (error) |
138 | return error; | |
139 | ||
1a14d3a6 | 140 | j_gl->gl_ops->go_inval(j_gl, DIO_METADATA); |
b3b94faa DT |
141 | |
142 | error = gfs2_find_jhead(sdp->sd_jdesc, &head); | |
143 | if (error) | |
144 | goto fail; | |
145 | ||
146 | if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { | |
147 | gfs2_consist(sdp); | |
148 | error = -EIO; | |
149 | goto fail; | |
150 | } | |
151 | ||
152 | /* Initialize some head of the log stuff */ | |
153 | sdp->sd_log_sequence = head.lh_sequence + 1; | |
154 | gfs2_log_pointers_init(sdp, head.lh_blkno); | |
155 | ||
b3b94faa DT |
156 | error = gfs2_quota_init(sdp); |
157 | if (error) | |
a91ea69f | 158 | goto fail; |
b3b94faa DT |
159 | |
160 | set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags); | |
161 | ||
162 | gfs2_glock_dq_uninit(&t_gh); | |
163 | ||
164 | return 0; | |
165 | ||
a91ea69f | 166 | fail: |
b3b94faa DT |
167 | t_gh.gh_flags |= GL_NOCACHE; |
168 | gfs2_glock_dq_uninit(&t_gh); | |
169 | ||
170 | return error; | |
171 | } | |
172 | ||
bb8d8a6f SW |
173 | static void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf) |
174 | { | |
175 | const struct gfs2_statfs_change *str = buf; | |
176 | ||
177 | sc->sc_total = be64_to_cpu(str->sc_total); | |
178 | sc->sc_free = be64_to_cpu(str->sc_free); | |
179 | sc->sc_dinodes = be64_to_cpu(str->sc_dinodes); | |
180 | } | |
181 | ||
182 | static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf) | |
183 | { | |
184 | struct gfs2_statfs_change *str = buf; | |
185 | ||
186 | str->sc_total = cpu_to_be64(sc->sc_total); | |
187 | str->sc_free = cpu_to_be64(sc->sc_free); | |
188 | str->sc_dinodes = cpu_to_be64(sc->sc_dinodes); | |
189 | } | |
190 | ||
b3b94faa DT |
191 | int gfs2_statfs_init(struct gfs2_sbd *sdp) |
192 | { | |
feaa7bba | 193 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); |
bd209cc0 | 194 | struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; |
feaa7bba | 195 | struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); |
bd209cc0 | 196 | struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; |
b3b94faa DT |
197 | struct buffer_head *m_bh, *l_bh; |
198 | struct gfs2_holder gh; | |
199 | int error; | |
200 | ||
201 | error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE, | |
202 | &gh); | |
203 | if (error) | |
204 | return error; | |
205 | ||
206 | error = gfs2_meta_inode_buffer(m_ip, &m_bh); | |
207 | if (error) | |
208 | goto out; | |
209 | ||
210 | if (sdp->sd_args.ar_spectator) { | |
211 | spin_lock(&sdp->sd_statfs_spin); | |
212 | gfs2_statfs_change_in(m_sc, m_bh->b_data + | |
213 | sizeof(struct gfs2_dinode)); | |
214 | spin_unlock(&sdp->sd_statfs_spin); | |
215 | } else { | |
216 | error = gfs2_meta_inode_buffer(l_ip, &l_bh); | |
217 | if (error) | |
218 | goto out_m_bh; | |
219 | ||
220 | spin_lock(&sdp->sd_statfs_spin); | |
221 | gfs2_statfs_change_in(m_sc, m_bh->b_data + | |
222 | sizeof(struct gfs2_dinode)); | |
223 | gfs2_statfs_change_in(l_sc, l_bh->b_data + | |
224 | sizeof(struct gfs2_dinode)); | |
225 | spin_unlock(&sdp->sd_statfs_spin); | |
226 | ||
227 | brelse(l_bh); | |
228 | } | |
229 | ||
a91ea69f | 230 | out_m_bh: |
b3b94faa | 231 | brelse(m_bh); |
a91ea69f | 232 | out: |
b3b94faa | 233 | gfs2_glock_dq_uninit(&gh); |
b3b94faa DT |
234 | return 0; |
235 | } | |
236 | ||
cd915493 SW |
237 | void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free, |
238 | s64 dinodes) | |
b3b94faa | 239 | { |
feaa7bba | 240 | struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); |
bd209cc0 | 241 | struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; |
b3b94faa DT |
242 | struct buffer_head *l_bh; |
243 | int error; | |
244 | ||
245 | error = gfs2_meta_inode_buffer(l_ip, &l_bh); | |
246 | if (error) | |
247 | return; | |
248 | ||
d4e9c4c3 | 249 | gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1); |
b3b94faa DT |
250 | |
251 | spin_lock(&sdp->sd_statfs_spin); | |
252 | l_sc->sc_total += total; | |
253 | l_sc->sc_free += free; | |
254 | l_sc->sc_dinodes += dinodes; | |
907b9bce | 255 | gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode)); |
b3b94faa DT |
256 | spin_unlock(&sdp->sd_statfs_spin); |
257 | ||
258 | brelse(l_bh); | |
259 | } | |
260 | ||
261 | int gfs2_statfs_sync(struct gfs2_sbd *sdp) | |
262 | { | |
feaa7bba SW |
263 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); |
264 | struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); | |
bd209cc0 AV |
265 | struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; |
266 | struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; | |
b3b94faa DT |
267 | struct gfs2_holder gh; |
268 | struct buffer_head *m_bh, *l_bh; | |
269 | int error; | |
270 | ||
271 | error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE, | |
272 | &gh); | |
273 | if (error) | |
274 | return error; | |
275 | ||
276 | error = gfs2_meta_inode_buffer(m_ip, &m_bh); | |
277 | if (error) | |
278 | goto out; | |
279 | ||
280 | spin_lock(&sdp->sd_statfs_spin); | |
281 | gfs2_statfs_change_in(m_sc, m_bh->b_data + | |
907b9bce | 282 | sizeof(struct gfs2_dinode)); |
b3b94faa DT |
283 | if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) { |
284 | spin_unlock(&sdp->sd_statfs_spin); | |
285 | goto out_bh; | |
286 | } | |
287 | spin_unlock(&sdp->sd_statfs_spin); | |
288 | ||
289 | error = gfs2_meta_inode_buffer(l_ip, &l_bh); | |
290 | if (error) | |
291 | goto out_bh; | |
292 | ||
293 | error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); | |
294 | if (error) | |
295 | goto out_bh2; | |
296 | ||
d4e9c4c3 | 297 | gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1); |
b3b94faa DT |
298 | |
299 | spin_lock(&sdp->sd_statfs_spin); | |
300 | m_sc->sc_total += l_sc->sc_total; | |
301 | m_sc->sc_free += l_sc->sc_free; | |
302 | m_sc->sc_dinodes += l_sc->sc_dinodes; | |
303 | memset(l_sc, 0, sizeof(struct gfs2_statfs_change)); | |
304 | memset(l_bh->b_data + sizeof(struct gfs2_dinode), | |
305 | 0, sizeof(struct gfs2_statfs_change)); | |
306 | spin_unlock(&sdp->sd_statfs_spin); | |
307 | ||
d4e9c4c3 | 308 | gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1); |
b3b94faa DT |
309 | gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode)); |
310 | ||
311 | gfs2_trans_end(sdp); | |
312 | ||
a91ea69f | 313 | out_bh2: |
b3b94faa | 314 | brelse(l_bh); |
a91ea69f | 315 | out_bh: |
b3b94faa | 316 | brelse(m_bh); |
a91ea69f | 317 | out: |
b3b94faa | 318 | gfs2_glock_dq_uninit(&gh); |
b3b94faa DT |
319 | return error; |
320 | } | |
321 | ||
b3b94faa DT |
322 | struct lfcc { |
323 | struct list_head list; | |
324 | struct gfs2_holder gh; | |
325 | }; | |
326 | ||
327 | /** | |
328 | * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all | |
329 | * journals are clean | |
330 | * @sdp: the file system | |
331 | * @state: the state to put the transaction lock into | |
332 | * @t_gh: the hold on the transaction lock | |
333 | * | |
334 | * Returns: errno | |
335 | */ | |
336 | ||
08bc2dbc AB |
337 | static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp, |
338 | struct gfs2_holder *t_gh) | |
b3b94faa | 339 | { |
5c676f6d | 340 | struct gfs2_inode *ip; |
b3b94faa DT |
341 | struct gfs2_jdesc *jd; |
342 | struct lfcc *lfcc; | |
343 | LIST_HEAD(list); | |
55167622 | 344 | struct gfs2_log_header_host lh; |
b3b94faa DT |
345 | int error; |
346 | ||
b3b94faa DT |
347 | list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { |
348 | lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL); | |
349 | if (!lfcc) { | |
350 | error = -ENOMEM; | |
351 | goto out; | |
352 | } | |
feaa7bba SW |
353 | ip = GFS2_I(jd->jd_inode); |
354 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh); | |
b3b94faa DT |
355 | if (error) { |
356 | kfree(lfcc); | |
357 | goto out; | |
358 | } | |
359 | list_add(&lfcc->list, &list); | |
360 | } | |
361 | ||
362 | error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED, | |
6802e340 | 363 | GL_NOCACHE, t_gh); |
b3b94faa DT |
364 | |
365 | list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { | |
366 | error = gfs2_jdesc_check(jd); | |
367 | if (error) | |
368 | break; | |
369 | error = gfs2_find_jhead(jd, &lh); | |
370 | if (error) | |
371 | break; | |
372 | if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { | |
373 | error = -EBUSY; | |
374 | break; | |
375 | } | |
376 | } | |
377 | ||
378 | if (error) | |
379 | gfs2_glock_dq_uninit(t_gh); | |
380 | ||
a91ea69f | 381 | out: |
b3b94faa DT |
382 | while (!list_empty(&list)) { |
383 | lfcc = list_entry(list.next, struct lfcc, list); | |
384 | list_del(&lfcc->list); | |
385 | gfs2_glock_dq_uninit(&lfcc->gh); | |
386 | kfree(lfcc); | |
387 | } | |
b3b94faa DT |
388 | return error; |
389 | } | |
390 | ||
391 | /** | |
392 | * gfs2_freeze_fs - freezes the file system | |
393 | * @sdp: the file system | |
394 | * | |
395 | * This function flushes data and meta data for all machines by | |
396 | * aquiring the transaction log exclusively. All journals are | |
397 | * ensured to be in a clean state as well. | |
398 | * | |
399 | * Returns: errno | |
400 | */ | |
401 | ||
402 | int gfs2_freeze_fs(struct gfs2_sbd *sdp) | |
403 | { | |
404 | int error = 0; | |
405 | ||
f55ab26a | 406 | mutex_lock(&sdp->sd_freeze_lock); |
b3b94faa DT |
407 | |
408 | if (!sdp->sd_freeze_count++) { | |
409 | error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh); | |
410 | if (error) | |
411 | sdp->sd_freeze_count--; | |
412 | } | |
413 | ||
f55ab26a | 414 | mutex_unlock(&sdp->sd_freeze_lock); |
b3b94faa DT |
415 | |
416 | return error; | |
417 | } | |
418 | ||
419 | /** | |
420 | * gfs2_unfreeze_fs - unfreezes the file system | |
421 | * @sdp: the file system | |
422 | * | |
423 | * This function allows the file system to proceed by unlocking | |
424 | * the exclusively held transaction lock. Other GFS2 nodes are | |
425 | * now free to acquire the lock shared and go on with their lives. | |
426 | * | |
427 | */ | |
428 | ||
429 | void gfs2_unfreeze_fs(struct gfs2_sbd *sdp) | |
430 | { | |
f55ab26a | 431 | mutex_lock(&sdp->sd_freeze_lock); |
b3b94faa DT |
432 | |
433 | if (sdp->sd_freeze_count && !--sdp->sd_freeze_count) | |
434 | gfs2_glock_dq_uninit(&sdp->sd_freeze_gh); | |
435 | ||
f55ab26a | 436 | mutex_unlock(&sdp->sd_freeze_lock); |
b3b94faa DT |
437 | } |
438 |